[ symfony ] Klucze obce - blad przy budowaniu modelu Opcje

[basu]

Witam,
PRobuje utworzyc tabele z powiazaniem wiele do wielu.
Mam problem w czasie tworzenia modelu komenda ' symfony propel-build-model'. Po utworzeniu tabeli 'gallery_author' dostaje blad:

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<?php
propel > om-template:
[propel-om] Target database type: mysql
[propel-om] Target package: lib.model
[propel-om] Using template path: /usr/share/php/symfony/vendor/propel-generator/templates
[propel-om] Output directory: /www/symfony/company
[propel-om] Processing: schema.xml
Execution of target "om-template" failed for the following reason: /usr/share/php/symfony/vendor/propel-generator/build-propel.xml:470:1: ERROR!! Attempt to set foreign key to nonexistent column, id, in table, author!
[phingcall] /usr/share/php/symfony/vendor/propel-generator/build-propel.xml:470:1: ERROR!! Attempt to set foreign key to nonexistent column, id, in table, author!
?>
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Plik schema.xml:

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<?xml version="1.0" encoding="UTF-8"?>
 <database name="propel" noXsd="true" defaultIdMethod="none" package="lib.model">
   <table name="author">
	 <column name="author_id" type="integer" required="true" primaryKey="true" autoIncrement="true" />
	 <column name="author_firstname" type="varchar" size="30" required="true" />
	 <column name="author_lastname" type="varchar" size="30" required="true" />
	 <column name="author_telephone" type="varchar" size="15" />
	 <column name="author_email" type="varchar" size="30" />
	 <column name="author_status" type="boolean" required="true" default="1" />
	 <column name="updated_at" type="timestamp" />
	 <column name="created_at" type="timestamp" />
   </table>
   
   <table name="gallery">
	 <column name="gallery_id" type="integer" required="true" primaryKey="true" autoIncrement="true" />
	 <column name="gallery_name" type="varchar" size="100" required="true" />
	 <column name="gallery_desc" type="varchar" size="255" />
	 <column name="gallery_img" type="varchar" size="50" />
	 <column name="gallery_status" type="boolean" required="true" default="1" />
	 <column name="updated_at" type="timestamp" />
	 <column name="created_at" type="timestamp" />
   </table>
   
   <table name="gallery_author">
	 <column name="gallery_author_id" type="integer" required="true" primaryKey="true" autoIncrement="true" />
	 <column name="author_id" type="integer" />
	 <foreign-key foreignTable="author">
	   <reference local="author_id" foreign="id"/>
	 </foreign-key>
	 <column name="gallery_id" type="integer" />
	 <foreign-key foreignTable="gallery">
	   <reference local="gallery_id" foreign="id"/>
	 </foreign-key>
   </table>
</database>
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